Amplifier



FIG. 1 is a perspective view of an amplifier, showing my new design;

FIG. 2 is a front view of the amplifier;

FIG. 3 is a rear view of the amplifier;

FIG. 4 is a left side view of the amplifier;

FIG. 5 is a right side view of the amplifier;

FIG. 6 is a top view of the amplifier; and,

FIG. 7 is a bottom view of the amplifier.

The broken lines shown in the drawings depict portions of the amplifier that form no part of the claimed design. 

CLAIM The ornamental design for an amplifier, as shown and described. 